diff options
| author | Eric Farman <farman@linux.ibm.com> | 2019-07-02 21:09:28 +0300 |
|---|---|---|
| committer | Cornelia Huck <cohuck@redhat.com> | 2019-07-05 08:58:53 +0300 |
| commit | c382cbc6dbf513d73cf896ad43a3789ad42c2e2f (patch) | |
| tree | 90185383628daf3550077cebaabf664033b8d80a /drivers | |
| parent | 05f31e3bf6b34fe6e4922868d132f6455f81d5bf (diff) | |
| download | linux-c382cbc6dbf513d73cf896ad43a3789ad42c2e2f.tar.xz | |
vfio-ccw: Fix the conversion of Format-0 CCWs to Format-1
When processing Format-0 CCWs, we use the "len" variable as the
number of CCWs to convert to Format-1. But that variable
contains zero here, and is not a meaningful CCW count until
ccwchain_calc_length() returns. Since that routine requires and
expects Format-1 CCWs to identify the chaining behavior, the
format conversion must be done first.
Convert the 2KB we copied even if it's more than we need.
Fixes: 7f8e89a8f2fd ("vfio-ccw: Factor out the ccw0-to-ccw1 transition")
Reported-by: Farhan Ali <alifm@linux.ibm.com>
Signed-off-by: Eric Farman <farman@linux.ibm.com>
Reviewed-by: Cornelia Huck <cohuck@redhat.com>
Message-Id: <20190702180928.18113-1-farman@linux.ibm.com>
Signed-off-by: Cornelia Huck <cohuck@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/s390/cio/vfio_ccw_cp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/s390/cio/vfio_ccw_cp.c b/drivers/s390/cio/vfio_ccw_cp.c index a7b9dfd5b464..1d4c893ead23 100644 --- a/drivers/s390/cio/vfio_ccw_cp.c +++ b/drivers/s390/cio/vfio_ccw_cp.c @@ -431,7 +431,7 @@ static int ccwchain_handle_ccw(u32 cda, struct channel_program *cp) /* Convert any Format-0 CCWs to Format-1 */ if (!cp->orb.cmd.fmt) - convert_ccw0_to_ccw1(cp->guest_cp, len); + convert_ccw0_to_ccw1(cp->guest_cp, CCWCHAIN_LEN_MAX); /* Count the CCWs in the current chain */ len = ccwchain_calc_length(cda, cp); |